Integrity hashes do not work if contenthash is a query string

[rvock]

If you are using the [contenthash] as a query string, the integrity hashes are not generated.

Example webpack.config.js

const Encore = require('@symfony/webpack-encore');

Encore
	// directory where compiled assets will be stored
	.setOutputPath('build/')
	// public path used by the web server to access the output path
	.setPublicPath('/build/')
	.setManifestKeyPrefix('build/')

	// hash as querystring instead of in filename
	.configureFilenames({
		js: '[name].js?[contenthash]',
	})

	.addEntry('example', './src/example.js')

	.disableSingleRuntimeChunk()

	.enableVersioning(Encore.isProduction())

	.enableIntegrityHashes(Encore.isProduction())
;

module.exports = Encore.getWebpackConfig();

Generated entrypoints.json

{
  "entrypoints": {
    "example": {
      "js": [
        "/static/build/example.js?621df54d056c27d5eaa8"
      ]
    }
  },
  "integrity": {}
}

The problem exists, because entry-files-manifest.js assumes the filename is a a valid file:

webpack-encore/lib/plugins/entry-files-manifest.js

Lines 52 to 57 in 6b75c4d

	const filePath = path.resolve(
	webpackConfig.outputPath,
	file.replace(publicPath, '')
	);
	if (fs.existsSync(filePath)) {

If the query string would be stripped, the file path should be correct.